Final answer:
The organisms in a lake environment are most likely arranged in an energy pyramid in the order of phytoplankton → zooplankton → small fish → large fish.
Step-by-step explanation:
In a lake environment, the organisms would most likely be arranged in an energy pyramid in the following order: a. Phytoplankton → Zooplankton → Small Fish → Large Fish. This is because the phytoplankton, which are primary producers, provide energy for the zooplankton. The zooplankton, in turn, are consumed by small fish, which are then consumed by larger fish.